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Finding the Fourth Proportional to 69.09, 95.35 and 39.99

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Solution

The fourth proportional to 69.09, 95.35 and 39.99 is: 55.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.09 : 95.35 = 39.99 : x
  2. Step 2: Convert to fraction form
    69.09/95.35 = 39.99/x
  3. Step 3: Cross multiply
    69.09x = 95.35 × 39.99
  4. Step 4: Simplify right side
    69.09x = 3,812.95
  5. Step 5: Solve for x
    x = 3,812.95/69.09
  6. Step 6: Final answer
    x = 55.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.